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I see it as sagitta maths. Sag (x) = r^2/2R
eg 1 - 178x178/2(700) = 31684 divided by 1400 =22.63
eg 2 - = 31684 divided by 2000 =15.84
eg 3 - = 31684divided by 3000 =10.56
That's my theory
Last edited by scopemankit; 16-11-2010 at 08:00 PM.
Reason: figures came up as twlrphone numbers
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